主题：初产妇 | 医源世界 关键词】 延期妊娠； 胎头； 剖宫产 [gap=1510]Key words】 delayed pregnancy； fetus head； cesarean deliver
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Majority fetus head position unusually is persistent occipitoposterior position and persistent occipitotransverse position, can trying the delivery;
大多数胎头位置异常为持续性枕横位和枕后位，可以试产；
Technically, back labor occurs when the fetus is in a posterior position, with its face up and the back of its head pressing against your sacrum, or the back of your pelvis.
从技术上来说，背阵痛发生在胎儿处于背对的位置，它的脸朝上而后脑勺紧靠你的骶骨或者骨盆后方。
The fetus of the diabetic gravida may also have disproportionately large shoulders and body size compared with the head.
糖尿病孕妇的胎儿也可能有与胎头不相称的肩宽或躯体过大。
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